INFO: task syz.8.561:8539 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.8.561       state:D stack:27648 pid:8539  tgid:8538  ppid:7977   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17c4/0x4d60
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x5fd/0x8f0
 down_read+0x98/0x2e0
 super_lock+0x2a9/0x3b0
 __iterate_supers+0x126/0x290
 __se_sys_quotactl+0x353/0x950
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb23cf8efc9
RSP: 002b:00007fb23b1f6038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007fb23d1e5fa0 RCX: 00007fb23cf8efc9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000102
RBP: 00007fb23d011f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb23d1e6038 R14: 00007fb23d1e5fa0 R15: 00007fff2b2386d8
 </TASK>
INFO: task syz.8.561:8540 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.8.561       state:D stack:25368 pid:8540  tgid:8538  ppid:7977   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17c4/0x4d60
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x5fd/0x8f0
 down_read+0x98/0x2e0
 super_lock+0x2a9/0x3b0
 __iterate_supers+0x126/0x290
 __se_sys_quotactl+0x353/0x950
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb23cf8efc9
RSP: 002b:00007fb23b1d5038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007fb23d1e6090 RCX: 00007fb23cf8efc9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000102
RBP: 00007fb23d011f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb23d1e6128 R14: 00007fb23d1e6090 R15: 00007fff2b2386d8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/35:
 #0: ffffffff8df3d5a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5643:
 #0: ffff88810924a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000357b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
2 locks held by syz-executor/7284:
3 locks held by syz-executor/8057:
1 lock held by syz.8.561/8539:
 #0: ffff88817649a0e0 (&type->s_umount_key#65){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.8.561/8540:
 #0: ffff88817649a0e0 (&type->s_umount_key#65){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
2 locks held by syz-executor/10087:
1 lock held by syz.7.827/10203:
 #0: ffff88817649a0e0 (&type->s_umount_key#65){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.9.999/10961:
 #0: ffff88816a8200e0 (&type->s_umount_key#65){++++}-{4:4}, at: super_lock+0x25c/0x3b0
2 locks held by syz-executor/11330:
 #0: ffff8881b20bc0e0 (&type->s_umount_key#52){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffffffff8df43038 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f6/0x730

=============================================

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 35 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 nmi_cpu_backtrace+0x39e/0x3d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 watchdog+0xfa9/0xff0
 kthread+0x711/0x8a0
 ret_from_fork+0x4bc/0x870
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 7284 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:mark_lock+0xa5/0x190
Code: 8d 48 c7 c6 86 8f 85 8d e8 28 94 e5 ff 90 0f 0b 90 90 90 31 c9 4c 89 fe 4c 89 f7 b8 01 00 00 00 85 69 60 74 10 5b 41 5c 41 5d <41> 5e 41 5f 5d c3 cc cc cc cc cc 49 89 fe 49 89 f7 e8 35 b1 ff ff
RSP: 0018:ffffc90003b776d0 EFLAGS: 00000002
RAX: 0000000000000001 RBX: ffff88816ed68000 RCX: ffffffff9323db40
RDX: 0000000000000002 RSI: ffff88816ed68b80 RDI: ffff88816ed68000
RBP: 0000000000000004 R08: 0000000000000000 R09: ffffffff8412686f
R10: dffffc0000000000 R11: ffffed1034e1a27f R12: 0000000000000004
R13: 0000000000000004 R14: ffff88816ed68b80 R15: ffff88816ed68ba0
FS:  000055555577d500(0000) GS:ffff8882a9eeb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000017438c000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __lock_acquire+0x9b6/0xd20
 lock_acquire+0x120/0x360
 down_write+0x96/0x1f0
 f2fs_write_checkpoint+0x55f/0x2440
 kill_f2fs_super+0x2cc/0x6d0
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x425/0x4c0
 task_work_run+0x1d4/0x260
 exit_to_user_mode_loop+0xe9/0x130
 do_syscall_64+0x2bd/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdab13902f7
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffcfd584138 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fdab13902f7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffcfd5841f0
RBP: 00007ffcfd5841f0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffcfd585280
R13: 00007fdab1411d7d R14: 000000000001d7a0 R15: 00007ffcfd5852c0
 </TASK>
